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NWFPA Choosing a Sanitizer Donald Jones djones@aquaphoenixsci.com. What is Cleaning?. T he Removal of Soil Particles from Surfaces by Mechanical, Manual, or Chemical Methods. What is Sanitizing?.

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Presentation Transcript
slide1

NWFPA

Choosing a Sanitizer

Donald Jones

djones@aquaphoenixsci.com

what is cleaning
What is Cleaning?
  • The Removal of Soil Particles from Surfaces by Mechanical, Manual, or Chemical Methods.
what is sanitizing
What is Sanitizing?

The Treatment of a CleanedSurface with a Chemical or Physical Agent to Destroy Disease / Spoilage Causing Organisms. Reduces Total Vegetative Cell Population to a “Safe Level”.

sanitizing
Sanitizing

You Cannot Sanitize a Dirty Surface.

types of sanitizers
Types of Sanitizers
  • Heat
  • Chlorine
  • Chlorine Dioxide
  • Iodine
  • Peroxyacetic Acid
  • Acid Sanitizers
  • Quats
slide6
Heat
  • Hot Water is Used at 170° F for a Minimum of 5 Minutes.
  • Steam May be Used if the Outlet Temperature is a Minimum of 200° F for 5 Minutes.
  • NOTE: All Equipment Must Reach Minimum Times and Temperatures.
slide7

Chlorine

Hypochlorous Acid

chlorine
Chlorine
  • Made From a Combination of NaOH and Chlorine Gas.
  • Forms OCl ( Hypochlorite Ion ) in Alkaline Solutions.
  • Forms HOCl ( Hypochlorous Acid ) in Neutral to Acidic Solutions.
  • Both Kill, HOCl is 80X More Effective.
chlorine10
Advantages:

Broad Spectrum

Kills Spores and Phage

Liquids or Powders

OK in Hard Water

Inexpensive

Disadvantages:

Corrosive

Irritating to Skin

Very pH Sensitive

Sensitive to Organics

Keep Below 120° F.

Chlorine
chlorine dioxide
Chlorine Dioxide
  • More Effective than “Regular” Chlorine.
  • Chlorine has 2 Electron Receivers, Chlorine Dioxidehas Five. 2 ½ more Oxidizing Power.
  • Used at Very Low Concentrations. (.5 to 5 ppm)
  • Generated On-Site.
  • Excellent for Water Treatment.
  • ClO2
chlorine dioxide13
Advantages:

Broad Spectrum

Kills Spores / Phages

OK in Hard Water

Very Economical

Safe for Environment

Wide pH Range

No THM’s (Trihalomethanes)

Bio-film Removal

Tolerate High Organic Load

Low Organoleptic Impact

Disadvantages:

May Gas-Off

On-Site Generators

Needs Special Training

Must Follow Directions

Chlorine Dioxide
iodine
Iodine
  • Very Successful Since the 1940s.
  • Similar to Chlorine in Killing Microbes.
  • Surfactant + Iodine = Iodophore
  • Used at Very Low Concentrations.
iodine16
Advantages:

Broad Spectrum

Color Coded

Non-Irritating

Manual Use

Stable Solutions

CIP Use

Economical

Disadvantages:

pH Sensitive

Use Under 120° F

Odor

Corrosive if Abused

Iodine
acid sanitizers
Acid Sanitizers
  • Combinations of Acids and Surfactants or Fatty Acids.
  • They Kill by Shutting Down the Cell Membrane.
  • Many Different Types.
  • Used Since 1954.
acid sanitizers19
Advantages:

Broad Spectrum

High Anti-microbial Against G-

Organic Tolerant

Acid Rinse

Stable Solutions

Non-Corrosive to SS

OK in Hard Water

CIP, and Manual Use

Wide Temperature Range

Disadvantages:

pH Sensitive

Some Foam in CIP

Variable Phage Kill

Contains Phosphate

Slower Than Cl or I2

Corrosive to Soft Metals

Acid Sanitizers
peroxyacetic acid
Peroxyacetic Acid
  • Combination of Acetic Acid and H2O2.
  • Used World Wide Since Around 1902.
  • Used in U.S. Since mid-80s.
  • Kills by Oxidation
peroxyacetic acid22
Advantages:

Broad Spectrum

No Foam

Environmentally Safe

Good on Bio-films

Stable Solutions

Wide pH Range

Disadvantages:

Strong Oxidizer

Pungent Odor

Not an Acid Rinse

Special Training Needed

Limited Manual Use

Peroxyacetic Acid
quats
Quats
  • Combination of Cationic Surfactants and Water.
  • Many Varied Formulas.
  • Used for Over 50 Years.
  • Kill by Shutting Down the Cell Membrane.
  • Usually Product of Choice for Environmental Sanitizing
quats25
Advantages:

Low Toxicity

Non-Irritating

Non-Corrosive

Heat/Organic Stable

High Activity for G+

Yeast/Mold Control

Residual

Non-Volatile

Can be Acidified

Disadvantages:

Low Activity for G-

Anionic Contamination Reduces Activity

Residual

Foam in CIP

Quats
hydrogen peroxide
Hydrogen Peroxide
  • Strong Oxidizing Agents
  • Strong Bactericide
  • Ability to Make Environment Unsuitable for Organism Growth
  • Exercise Extreme Care in Handling Hydrogen Peroxide.
    • Strong Oxidizing Agent
    • Potentially Explosive
sanitizers of interest
Sanitizers of Interest
  • Chlorine Sanitizer
  • ClO2 Sanitizer
  • Iodine Sanitizer
  • Quat Sanitizers
  • Acid Sanitizers
  • PAA Sanitizer

Na O Cl

CH3 CH3

CH3 CH CH2 CH CH

CH2

CH2

O (CH2CH2O)9

CH3

R1 N CH3

CH2

C2H5

CH3(CH2)4CH(CH2)6CH3

O

CH3 C O OH

SO3

germicidal speed
Germicidal Speed

Slowest

Fastest

effective ph range
Effective pH Range

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

ph considerations
pH Considerations
  • What is the pH of your Water?
  • Acid Sanitizer: Phosphoric Acid 50%

Use Ratio: 1 to 6

  • Acid Sanitizer: Phosphoric Acid 30%

Use Ratio: 1 to 10

corrosion potential
Corrosion Potential

At use dilution - based on a scale of 1 to 10

foaming potential
Foaming Potential

Foam levels at “no rinse” use dilutions.

environmental impact
Environmental Impact

On a scale of 1 to 10 - 10 having the greatest impact.